How to find the missing sides and angles on congruent figures

I would like for you to be a bit more specific in your question, but, generally, congruent figures have both angles and sides measurements equal to each other. This means that they have to be of the same shape too. So if you know that one side of a figure is 5 units, for example, then the same side of another congruent figure is also going to be 5 units.